Shift control device for vehicle transmission

A shift control device for a vehicle transmission in which a shift fork for selectively establishing a gear train of multiple shift stages provided between a main shaft to which power from an internal combustion engine is transmitted and a countershaft connected to a driven wheel engages with a lead groove provided in the outer periphery of a shift drum, drive means for making the shift drum pivot being connected to the shift drum, characterized in that the drive means comprises a power source disposed at one end, in the axial direction, of the shift drum, and a transmission shaft running coaxially and relatively rotatably through the shift drum so that power from the power source is transmitted thereto at said one end, in the axial direction, of the shift drum and being operatively connected to the other end, in the axial direction, of the shift drum, the power source is disposed so as to have a rotational axis thereof perpendicular to the axis of the shift drum, and the transmission shaft is supported on the shift drum.

A shift control device for a vehicle transmission in which a shift fork for selectively establishing a gear train of multiple shift stages provided between a main shaft to which power from an internal combustion engine is transmitted and a countershaft connected to a driven wheel engages with a lead groove provided in the outer periphery of a shift drum, drive mechanism which makes the shift drum pivot being connected to the shift drum, wherein the drive mechanism comprises a power source disposed at one end, in the axial direction, of the shift drum, and a transmission shaft running coaxially and relatively rotatably through the shift drum so that power from the power source is transmitted thereto at said one end, in the axial direction, of the shift drum and being operatively connected to the other end, in the axial direction, of the shift drum, the power source is disposed so as to have a rotational axis thereof perpendicular to the axis of the shift drum, and the transmission shaft is supported on the shift drum.